Process of cooling electric furnaces by air.



H. MAGRON. mousse 0F 000mm ELEOTRIGEURNAOES BY AIR. APPLIOA-TION TILED FEB. 9, 1915.

Patented Mar. 9, 1915.

UNITED srarns PATENT OFFICE.

HENRI ,MAGRON, or see, HAUTE-GARONNE, FRANCE.

success or coonru'e ELECTRIC FURNACES BY AIR.

Application filed February 9, 1915. Serial No. 8,991.

To ally whom it may concern .7 lie it known that I, l'lrmnr MAeiioN, engineer, of Fos, Haute-Garonne, France, have invented a new. and useful Process of Cooling Electric Furnaces by Air, which process isfully set forth in thc'follow ng specification.

The present invention relates to a process for effectively cooling, by means of cold air or other gas, electric furnaces more especi ally designed for treating refractory materials requiring an elevated temperature n the interior of the furnace.

The method of cooling employed avoids all the inconveniences resulting from the -use of water whose presence in'the irmriedt.

' ate vicinity of amass carried to a high.tem-

perature is always dangerous whatever pr e cautions may-be taken in its use.

The air'utilized for cooling can be employedinseveral different ways, for example, either b simple circulation at lowpres' sure of a sul cient volume of air, thecooling .heing eifectedby. simple absorption of the heat in the mass of air, or by circulation of air at high pressure and utilizing there the cooling due to expansion, or by combination' ofthe'two means, or by air cooled'artifi-- cially. The circulation of air may be made aroundthe furnace vertically from top to bottom or from bottom to top, or horizontally or in any other way. The cooling of the exterior of the furnace permits suppressing the refractory linings,

frequently employed in electric furnaces, provided there is used the knownprocess which consists in utilizing the material to be treated or the material treated as a lining,

and the location of the casing. of the furnace is determined in accordancewith which of the'two methods is employed. It the mate{ rial to be treated is used as the lining, the airspace may .be siifiiciently restricted. so that the material may be fused. even up to the walls-of the furnace, and-all along the length of the cooled wall; on 'the contrary, if the.

material treated is used as the lining; theair space must be sufficiently large inorder that there shall. exist between the fused massand the caked or already treated portion, a space sufficient in order that the. materialnot transformed shall form a lining lt-i'is always to be noted that in thiscase the cooling permits reduction of thickness -of the" mate-- Specification of Letters Patent.

- rial not. treated to a 'limit relatively very .of example, a furnace for circulating air cylindrical, truncated or other shape made 5 alumina magnesia, carbon or the lilre, ac-

supply conduit 70 to the annular space 7 sur the atmosphere around the upper portion. of

Patented Mar. 9, 1915.

IHLI'I'OVV,

In the annexed drawings is shown, by way lengthwise from topto bottom located in a fixed casing of masonry.

Figure l is a vertical sectional view showing thefurnacc, and Fig. 2 is a plan view of the same. I

This furnace consists simply of a vat a of of sheet iron or other heat conducting mate rial, whose removable bottom Z) is secured to the walls either by bolts or by hooks or other means. On the bottom reposes a refractory lining c of convenient material such as silica,

cording to the operations to be carried out in the furnace.

In carrying out my method of cooling, air under high pressure is conducted through rounding the furnace and is discharged into the furnace. As theair enters'the annular cooling space 7, it is allowed to expand and g0 furthcr'expansion takes place where the air discharges at the top of the furnace. The air in expandingfrom a high pressure to a much lower pressure while passing in con-- tact with the walls of the furnace very efg5 fectively takes up heat from the outer portions of the charge in the-furnace and main-' 'tains a cool zone oftemperature inside and next the walls of the furnace where the-ore remains unaffected by the intense heat of the bath and forms a protecting lining for'thei walls of the receptacle.

The furnace is suspended at its up er extremity, by aid of suitable su ports from a fixedor movable casing e 0 any material, leaving. betwecn the two walls an annular space 7 for the circulation of air. The fur mice may be made with double walls between which the cooling air may becirculated.

i The Walls of the furnace at are provided at v theit" upper part with four hooks g forelevating it. The air is brought in at the lower part by a conduit is which delivers into the annular space 7. i v

As has been stated above, the furnace described is by Way of example, and it is to be understood that the method of cooling by. air, which isthe obJect of this invention, is

applicable to all kinds of electric furnaces, including furnaces with electrodes, resistance furnaces and induction furnaces.

I claim-- 1. A methodof cooling an electric furnace,

for smelting-ores consisting ,in circulating air 1n heat interchanging relation with the Walls of the furnace while expandingthe air relation With the Walls of the furnace While expanding the air for the purposeof cooling the outer portion of melting point.-

In testimony whereof I have'sig'ned this specification in the presence of two subs ib- ,lng witnesses.

Witnesses-z I. EARLY LAY, GABRIEL BELLIARD.

the charge below its I HENRI MAGRo i 

